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PATENT OFFICE.

THOMAS W. BOYS, OF SOUTHAMPTON, NEW YORK.

iMPRovi-:M ENT 1N PROPELLERS.'

Specification forming part of Letters Patent No. 35,475, dated June 3,1862'.

' To all whom it may concern.-

Beit known that I, THOMAS W. RoYs, of Southampton, in the county ofSuffolk and State of `New York,have invented an Improved Propeller forSteam and other Boats, and I do hereby declare that the following is afull, clear, and exact description of the same, reference being had tothe annexed drawings,

making partof thisspecication, and which illustrate my invention. i

y My propeller consists of a series of buckets linked together so as toform an endless sysdriving-wheel, from whence it receives its motion. i

Figure l on the drawings is a longitudinal section through a vessel,illustrating the propeller applied theretonnder the bottomthereof fromstem to stern. Fig. 2 is a stern elevation; Fig. 3, a plan ortop view.

In the drawings, Arepresents the vessel; B, the propeller; C, thedriving-Wheel, and D the track in which the propeller is made to travel.The propeller may be made long or short and to pass through the hull atthe stem and stern, or a little afore and aft the midships,as shown indotted` lines, or it may be made to pass through the stem and midshipsor the stern and midships,and the driving-wheel C may be located in anysuitable position to give proper effect to the propeller in thedifferent positions in which it may be applied. The bottom of i thevessel must be shaped to receive this style of propeller-that is tojsay,the bottom must he made quite flat at the side of the keel and the trackD made for the propeller to travel in, so as to keep it from surging.The track or i way must alsohave a flange to lap over the propeller, asat o, to keep it from sagging or falling out of its place when the'motion is reversed.

Over the holes madein the hull for the prof peller to pass through thereshould be pipes or tubes placed around the propeller in the inside ofthe vessel to keep the water out.

Over the track at the bow a shield may be made to keep the water fromheaping up into the cavity made for the propeller to travel through, andthus cause a loss by reaction.

rIhe propeller itself is composed of a series of flat links, a a, pinnedtogether, as shown, and in the center of these links the paddles areplaced with their propelling-surfaces at right angles with the line ofmotion, and they are held in that position by means of square gudgeonsmade on their ends, which gudgeons t in correspondingly-shaped holesmade in the links and long enough to reach through the said links andreceive on the outside thereof friction-wheels b, Which travel in thetrack and carry the propeller, the end of the gudgeons being made round,that the wheels may revolve freely about their own axis.

4The drivingwheel Chas arms f on its periphery,which work between thepaddles,and thus give motion to the propeller.

The power may be applied directly to the wheel O,or it may be geared .upin any known way.

In the inside of the vessel a track,H,is made to support the upper partof the propeller, so as to take the stress off of the bow and stern andcause the propeller to lie perfectly free,that it may move easily andwith as little friction as possible.

Having thus described the construction and operation of my improvedpropeller, what I claim as my invention, and desire to secure by LettersPatent, is-

Making the tracks or ways on the bottom and in the inside of the vessel,as described, and arranging the propeller therein, and operating thesame substantially in the manner Set forth.

THOMAS W. ROYS.

Vitnesses:

AMos BEOADNEX, WM. KEMBLE HALL.

